qcom/venus-4.2: drop split firmware in favour of the mbn file

Follow the example of the sc7280 and sc7180 (venus-5.4, vpu-2.0) and
drop the split firmare files (mdt + bNN) in favour of using the squashed
mbn file.  For backwards compatibility generate the mdt -> mbn symlink.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>

WHENCE

@@ -5604,13 +5604,8 @@ Link: qcom/venus-4.2/venus.mdt -> venus.mbn
 
 Version: 4.2
 
-File: qcom/venus-5.2/venus.mdt
-File: qcom/venus-5.2/venus.b00
-File: qcom/venus-5.2/venus.b01
-File: qcom/venus-5.2/venus.b02
-File: qcom/venus-5.2/venus.b03
-File: qcom/venus-5.2/venus.b04
 File: qcom/venus-5.2/venus.mbn
+Link: qcom/venus-5.2/venus.mdt -> venus.mbn
 
 Version: 5.2-00023
 

qcom/venus-5.2/venus.b04

@@ -1 +0,0 @@
-
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